Lock for feed-screws for rock-drilling engines.



No. 843,144. PATENTED FEB. 5, 190-7. P. E. GLAZE.

LOOK FOR FEED, SGREWS FOR ROCK DRILLING ENGINES.

"APPLICATION FILED MAR.16,1906.

UNITED s'rir ns PATENT orrron.

FREDERICK E. GLAZE, OF VICTOR, COLORADO.

LOOK FOR FEED-SCREWS FOR ROCK-DRILLING ENGINES.

No. 843,144. Specification of Letters Patent. Patented Feb. 5, 1907.

Anplica 1011 filed March 16,1906. Serial No. 306,403.

To (ti/Z whom it may concern.-

Be it known that I, FREDERICK a citizen of the United States of America, re siding at Victor,'county of Teller, and State 1, make room lor the hub. The hub is then of Colorado, have invented a new and useful held on the rod between the end of the tube Lock for Feed-Screws for Rock-Drilling Enand the yoke and is clamped to the rod by its gines, of which the following is a speci'licasplit portion. The hub of the lock is protion. vided with a lug 9, which projects from the My invention relates to improvements in 1 lower surface from its split clamp portion. devices for locking the feed-screws of rock- I I form a chamber 10 in this lug, which exdrilling engines against accidental movement tends into its farthest end from its split due to the ull or wei ht thereon of the drill clam in ortion. This chamber extends P c P e P l to near the opposite end oi the lug, where a cylinder; and the object of my invention is 4 square -bottom shoulder is formed, and

to provide a simple and eflective lock for l l through this shoulder and the opposite end I place this hub on the side rod close to the E. GLAZE, yoke, and in order to do this I remove one of the tubes 4 and cut enough otl' of its end to locking the feed-screws of rock-drilling engines against accidental movement when of the lug, which is reduced 1n size, a smaller they are not in operation drilling rock, and

my device is especially adapted for use in 12 fits slidably. This pawl-stem extends be: drilling either up or down holes, but espcyond the lug, and a linger-d1sk 13 is secured cially up holes. When drilling these holes, to it. The reduced end of this lug 9 is proit the teed-screws are not locked against ro vided with a slot 14 wide enough to receive tative movement the weight of the drill-cylloosely a pin 15, which is placed through the inder and piston-plunger will cause the feedstem and normally stands against the botscrew to rotate, and the cylinder will run tom of the slot, it being held there by the redown in its guideways to the end of its ieedsilient tension of a spring 16, which is placed ing movement and will necessitate being fed in the chamber of the lug and is held there by back to the point desired. I attain these i a shoulder 17, formed on the outer end of the objects by the mechanism illustrated in the stem at the end of the lug. The stem exaccompanying drawings, in which tends beyond this shoulder, and its terminal through a rockend is formed into a pawl 18, the face 19 of Figure 1 isa sectional view dr1lhng machine showing a lock which is de which is straight, and its other side 20 slopes at an angle backward. In the end oi the lug tachably connected to one of the side rods, so as to be applicable to machines not having an adjacent to the linger-disk I place a notch 21, arranging it at right angles to the slot 14,

integral housing. Fig. 2 is a perspective view of the detachable lock, and Fig. 3 1s afragmenwhich is a seat for the pin 15 when it is pulled back and it is desired to lock the pin 1n a retal perspective view showing the latch Withdrawn and held out of engagement with the traoted position, as will be explained more fully hereinafter. The feed-screw 1s always notched shoulder oi the screw.

Similar numerals of reference refer to s1miprovided with a collar 22, which forms an abutting shoulder against the yoke 5, through lar parts throughout the several views.

Referring to the drawings, the numeral 1 which the end of the feed-screw passes to the crank. The lock is positioned on one of the designates the fragment of the rear end of a rock-drilling engine, showing the feed-screw rods opposite this collar, and in the peripheral surface of the collar I cut at equal dis- 2, its supports, which comprise the side rods tances apart a plurality of notches 23, which 3 and their tubes 4, and the cross-yoke 5.

are adapted to receive the pawl, which is The lock is made independent of the drillingengme and is attached to 1t. held normally in them by the resilient pressure of its spring 16.

I will describe my improved struct 1t for application The operation of this form ol" my improved teed-screw lock is as follows: WVhen the pawl already in use.

The body of my lock consists of a circularis in the notches of the collar, as shown 1n Fig. 3, the teed-screw and the drill-cylinder shaped hub 6, having an axial aperture formed to fit one of the side rods of the drill, are locked against accidental retraction, an

1 the feed-screw is free to be rotated to feed and an extending portion 7 is split to form a the drill-cylinder "forward. Vhen it is declamping-sleeve, through the ends of which a bolt is passed to clamp it to the side rod. sired to turn the feed-screw to move the drilllock I conto dr1ll1ng-eng111es aperture 11 is l ormed, in which a pawl-stem.

ICC

cylinder backward, the operator takes hold of the finger-disk and draws the pawl-stem backward until the pin 15 has moved out of the slot 14 to the end of the lug, when he turns the pawl-stem around and drops the pin into the notch 21. The pawl is then locked out of engagement with the ratchetdisk. In case it is desired to lock the feedscrew, so that it can be fed backward and not be fed forward, the pawl-stem is turned completely around, so that its face 19 engages the side 24 of the notches, which looks the feed-screw, so that it can be fed backward by the crank, but not forward. The pawl is shaped so that the notches of the collar of the feed-screw will rotate easily with it in mesh with them in the opposite direction from its face.

My invention is simple, durable, and in practical use has proven to be a valuable attachment for rock-drilling engines.

Having described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. In a lock for feed-screws, for rcck-drilling engines, the combination with the yoke and the side rods, of the feed-screw having a collar abutting against said yoke, witha plurality of square notches, a split hub arranged to be removably secured to one of said side I rods, a lug in said hub, a pawl-stem extending loosely through said hub and rotatably mounted therein, a spring surrounding said pawl-stem in said chamber, and arranged to hold it in one direction of its movement in engagement with said notches in said collar, a recess in the end of said lug, a pin extending through said stem and seated in said recess, a finger'disk on the end ofsaid stern, a notch in the end of said lug in which to seat said pin when it is withdrawn from said recess, and its pawl end. is reversed relative to said notches, as specified.

2. In a lock for feed-screws of rock-drills, the combination with the yoke, the side rods and tubes and the feedscrew, having a yokeabutting collar, said collar being provided with ratchet-notches, of the split clampinghub removably clamped to one of said rods, the pawl-stem support, the pawl-stem rotatably mounted in said support, the pawl on one end of said pawl-stem, the finger-disk on its opposite end, the pawl-stem within said support, the pin and recess for defining the position of said pawl relative to said notches, and the notch for locking said pawl out of engagement With the Eotches of said feed-screws collar, as speci- In testimony whereof I affix in presence of two witnesses.

FREDERICK E. GLAZE.

my signature Witnesses:

G. SARGENT ELLIOTT, BESSIE THOMPSON.

spring surrounding said 

